EP 0166966 A2 19860108 - Video display controller.
Title (en)
Video display controller.
Title (de)
Videoanzeigesteuergerät.
Title (fr)
Dispositif de commande d'affichage vidéo.
Publication
Application
Priority
JP 11161384 A 19840531
Abstract (en)
A video display processor (VDP) produces a video signal by which a black and white image of an increased gradation can be displayed on a video display unit. The VDP reads from a video RAM (VRAM) color codes each representative of a color of each display element or amplitude data representative of amplitudes of a video signal to be reproduced. In the case of displaying an image based on the color codes, the color codes, are converted by a color palette circuit into color data each composed of three primary color data, and then supplied to a digital color encoder. The digital color encoder multiplies each of the three color data by predetermined coefficients at proper phase timings to output data representative of three chrominance signals. These data outputted from the color encoder are added together by an adder circuit and then converted into an analog signal to be supplied to the video display unit as the video signal. On the other hand, in the case of displaying an image based on the amplitude data, the color palette circuit converts the amplitude data into gradation data. The digital color encoder multiplies the gradation data by other proper coefficients so that data proportional in value to the gradation data are obtained at the output of the adder circuit. The thus obtained data are also converted into an analog signal to thereby reproduce the video signal. The VDP also comprises a color burst generator which generates under the control of a central processing unit a color burst signal to be added to the output of the digital color encoder.
IPC 1-7
IPC 8 full level
H04N 9/65 (2006.01); G09G 1/28 (2006.01); G09G 5/00 (2006.01); G09G 5/02 (2006.01); G09G 5/06 (2006.01)
CPC (source: EP US)
G09G 1/285 (2013.01 - EP US); G09G 5/06 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB NL
DOCDB simple family (publication)
EP 0166966 A2 19860108; EP 0166966 A3 19890614; EP 0166966 B1 19920304; DE 166966 T1 19860430; DE 3585463 D1 19920409; JP H0562346 B2 19930908; JP S60254190 A 19851214; US 4737772 A 19880412
DOCDB simple family (application)
EP 85106611 A 19850529; DE 3585463 T 19850529; DE 85106611 T 19850529; JP 11161384 A 19840531; US 73903685 A 19850529